Malicious PDF — malware analysis report

Static analysis result for SHA-256 24565a45ed6e72aa…

MALICIOUS

PDF

86.5 KB Created: 2021-10-06 00:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e22f5340bfde6cffdd0d95b1c0b27cf2 SHA-1: 93d017bd702cdfd49afd7d6fb5e01ac585b9f5ea SHA-256: 24565a45ed6e72aadf5a4acef20b3f1994555fab2421765bc8a8f9ce91c6ccf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mkserwis.pl/userfiles/file/79815113983.pdf In PDF document text
    • http://knipia.com/userfiles/file/kuxarapidu.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/90087691763.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/573f0ef6127bb1d681a63d09e662c137/85339620742.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/82986258675.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/18984567800.pdfIn PDF document text
    • http://vaynhe.com/upload/files/47397645986.pdfIn PDF document text
    • http://jainfarms.com/uploads/63080183460.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/6449779538.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/tigedutili.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/gizir.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/91920166147.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/6503225834.pdfIn PDF document text
    • http://harlit.com/upfiles/file/bopokexogakarifabudufux.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/nupogizamunaniz.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/95694679241.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/kaporifibakijabogutamafo.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/rusoneteneduletodelim.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/52130740046.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/65852631685.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/keruxapawu.pdfIn PDF document text
    • http://spakimthi.com/upload/files/rukataxisufegopitita.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/suradagifuduja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=teeth+bonding+before+and+afterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 18964 bytes
SHA-256: f7b42d02da3890e215db880ed7fc04d09ecd66884ea505e5e17acef1ec54f65f
font_01_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 10520 bytes
SHA-256: 5ef7bc9e4312328ce2d473241d27259365def01b8a3053a78753d0e7a29c70e0

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